Cylinder and shell for high-capacity battery and high-capacity battery

Abstract

The utility model belongs to the field of batteries, and particularly relates to a cylinder and a shell for a high-capacity battery and the high-capacity battery. And the safety problem of the existing high-capacity battery caused by electrification of the shell is solved. The high-capacity battery comprises a shell and n single batteries, the shell comprises the cylinder for the high-capacity battery and a cover plate covering the open end of the cylinder; the n single batteries are arranged in the inner cavity of the barrel along the same direction; a shared chamber is arranged in the shell, and the inner cavity of the shared chamber is communicated with the inner cavities of all the single batteries; avoiding holes corresponding to polar terminals of the single batteries are formed in the top plate of the shell; the polar terminal of each single battery extends out of the avoiding hole, and the shell top plate area corresponding to the avoiding hole is fixedly sealed with the shell of the single battery. According to the utility model, the insulating layer is arranged on the wall surface of the cylinder body, and the insulation between the cylinder body and each single battery is realized through the insulating layer, so that the safety performance of the high-capacity battery is improved.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, in particular to a cylinder body and a shell for a large-capacity battery and a large-capacity battery. Background Art

[0002] Currently, many single cells are connected in parallel or in series on the market to form large-capacity batteries (also called battery modules or battery packs).

[0003] However, the individual cells in existing large-capacity batteries are different from each other. Due to the existence of the barrel effect, they are often affected by the cell with the worst performance, which greatly limits the capacity limit and cycle times of the entire large-capacity battery. Therefore, how to improve the uniformity of each cell in a large-capacity battery has become the focus and difficulty of research in this field.

[0004] In order to solve the above problems, Chinese patent CN220324596U discloses a large-capacity battery, the structure of which is as follows Figure 1 As shown, this type of large-capacity battery includes a housing 4 and a plurality of single cells 3, wherein the plurality of single cells 3 are connected in parallel in sequence and arranged in the inner cavity of the housing 4; the housing 4 is provided with a shared chamber (the shared chamber described here is an electrolyte shared chamber 7 and / or a gas shared chamber 9), and the shared chamber is connected to the inner cavities of each single cell. The electrolyte and / or gas in the inner cavities of each single cell are connected through the electrolyte shared chamber and / or the gas shared chamber, so that the electrolyte and / or gas of all single cells are in the same system, reducing the differences between the single cells, and improving the consistency between the single cells to a certain extent, thereby improving the cycle life of the large-capacity battery to a certain extent.

[0005] In the above-mentioned large-capacity battery, if the shell of each single battery is charged, since each single battery is in direct contact with the shell, the shell will also be charged, which will cause certain safety hazards during use. Summary of the invention

[0006] The utility model aims to provide a cylinder, a shell and a large-capacity battery for a large-capacity battery, so as to overcome the safety problem of the existing large-capacity battery due to the shell being charged.

[0007] The utility model first aspect provides a cylinder for a large-capacity battery, which has at least one open end, and the inner cavity of the cylinder is used to accommodate n single cells, wherein n is an integer greater than 1; the special feature is that an insulating layer is provided on the wall of the cylinder.

[0008] The cylinder is a part of the outer shell. The utility model provides an insulating layer on the wall of the cylinder to achieve insulation between the cylinder and each single battery through the insulating layer, thereby improving the safety performance of the large-capacity battery.

[0009] Furthermore, the insulating layer is an enamel insulating layer, which has excellent insulating properties and can reliably achieve insulation between the single cell and the cylinder when the large-capacity battery is working; at the same time, the enamel insulating layer also has a certain wear resistance and is not easy to fall off or be damaged during assembly, transportation and use, thereby making the insulation reliability between the cylinder and the single cell high.

[0010] Furthermore, the thickness of the enamel insulation layer is 100um to 300um. Under this thickness, while ensuring the insulation performance, the cylinder also has better thermal conductivity performance.

[0011] Furthermore, the cylinder has two open ends, located at the left and right ends of the cylinder; and avoidance holes are provided on the top plate of the cylinder corresponding to the polarity terminals of each single battery.

[0012] Furthermore, the bottom plate of the cylinder has a protrusion in a direction away from the top plate of the cylinder to form an electrolyte sharing chamber; the top plate of the cylinder has a protrusion in a direction away from the bottom plate of the cylinder to form a gas sharing chamber.

[0013] The second aspect of the utility model also provides a large-capacity battery casing, which is special in that it includes a cover plate and the large-capacity battery cylinder, the cover plate covers the open end of the large-capacity battery cylinder, and an insulating layer is provided on the surface of the cover plate.

[0014] The third aspect of the utility model also provides a large-capacity battery, which is special in that it includes n single cells and the above-mentioned large-capacity battery housing;

[0015] n single cells are arranged in the same direction in the inner cavity of the shell;

[0016] A shared chamber is provided in the shell, and the inner cavity of the shared chamber is connected to the inner cavities of all single cells; avoidance holes are opened on the top plate of the shell corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the top plate area of ​​the shell corresponding to the avoidance holes is fixedly sealed with the shell of the single cell.

[0017] Furthermore, the above-mentioned large-capacity battery also includes a heat transfer tube, and a clamping portion is provided at the position where the polarity terminal of each single battery extends out of the avoidance hole, and the heat transfer tube is fixed on the clamping portion of the polarity terminal of each single battery.

[0018] Furthermore, the heat transfer tube is a metal tube, and an enamel insulation layer is provided on the wall of the metal tube. The utility model heat transfer tube is provided with an enamel insulation layer on the outer wall of the metal tube, and the enamel insulation layer has excellent wear resistance and insulation performance, and is not easy to fall off or be damaged during transportation, installation and use. When the large-capacity battery is working, the insulation between the heat transfer tube and the polarity terminal of the large-capacity battery can be reliably achieved, thereby improving the reliability of the large-capacity battery when working.

[0019] Furthermore, the heat transfer tube is a U-shaped tube section, including a first tube and a second tube parallel to each other and a connecting tube connected between the first tube and the second tube; the first tube is fixed to the clamping part of the polarity terminals of all the single cells on one side, and the second tube is fixed to the clamping part of the polarity terminals of all the single cells on the other side; the outer tube walls of the first tube and the second tube have an enamel insulation layer. The heat transfer tube includes a spliced ​​pipeline structure of the first tube, the second tube and the connecting tube, and the spliced ​​pipeline structure is easy to install. At the same time, the connecting tube in the spliced ​​pipeline can be an insulating tube to further increase the insulation performance of the heat transfer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of an explosion of a large-capacity battery in the background technology;

[0021] Figure 2 It is a structural schematic diagram of the cylinder in Example 1;

[0022] Figure 3 This is a schematic diagram of the structure of a large-capacity battery in Example 1;

[0023] Figure 4 This is a schematic diagram of the explosion of a large-capacity battery in Example 1;

[0024] Figure 5 is a schematic structural diagram of the support member in Example 1;

[0025] Figure 6 This is a schematic diagram of the structure in which support ribs are arranged on the top plate of the housing to form a liquid channel in Example 1;

[0026] Figure 7 It is a structural schematic diagram of the cylinder in Example 2;

[0027] Figure 8 This is a schematic diagram of the partial structure of a large-capacity battery in Example 2 (with one end plate removed);

[0028] Fig. 9 It is a structural schematic diagram of the cylinder in Example 3;

[0029] Fig.10 This is a schematic diagram of the structure of a large-capacity battery in Example 3;

[0030] Fig.11 This is a schematic diagram of a partial explosion of a large-capacity battery in Example 3;

[0031] Fig.12 It is a schematic diagram of the structure of the cylinder in Example 4;

[0032] Fig.13 This is a schematic diagram of the explosion of a large-capacity battery in Example 4;

[0033] Fig.14 This is a schematic diagram of the structure of a large-capacity battery in Example 5;

[0034] Fig.15 This is a schematic diagram of the structure of a large-capacity battery in Example 6;

[0035] The accompanying drawings in the figure are marked as follows:

[0036] 1. Cylinder; 11. Cylinder top plate; 12. Cylinder bottom plate; 2. Avoidance hole; 3. Single cell; 31. Polarity terminal; 4. Shell; 5. End plate; 6. Support member; 61. First support rib; 62. Second support rib; 7. Electrolyte shared chamber; 8. Support rib; 9. Gas shared chamber; 10. Partition; 13. Upper cover plate; 14. Lower cover plate; 15. Heat transfer tube; 151. First tube; 152. Second tube; 153. Connecting tube; 16. Liquid cooling plate. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the utility model, but not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary persons in the field without creative work should fall within the scope of protection of the utility model.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "top, bottom" etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first, second, third, fourth, etc." are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0040] The utility model is a cylinder for large-capacity batteries, the inner cavity of which is used to accommodate n single batteries, wherein n is an integer greater than 1; a rectangular cylinder is usually selected, and the n single batteries are arranged in the inner cavity of the cylinder along the length direction of the rectangular cylinder.

[0041] For the convenience of description, the length direction of the cylinder is defined as the x direction, the width direction of the cylinder is defined as the y direction, and the height direction of the cylinder is defined as the z direction.

[0042] Such a cylinder has at least one open end and can have at least the following three structures:

[0043] The first structure includes a cylinder with open ends at both ends (i.e., two ports parallel to the yz plane are open ends);

[0044] The second structure includes a cylinder with open ends at the top and bottom (i.e., both ports parallel to the xy plane are open ends);

[0045] The third structure includes a cylinder with an open end at the top (i.e., one of the ports parallel to the xy plane is the open end);

[0046] The above-mentioned cylinder is usually made of the same metal material as the shell of the single battery. When the shell of the single battery is charged, since the single battery is in direct contact with the cylinder, the cylinder will inevitably be charged, which poses a safety hazard. In order to solve this problem and ensure the safety performance of large-capacity batteries with such a cylinder, the utility model insulates the cylinder, which can be achieved by spraying insulating paint on the wall of the cylinder, wrapping an insulating film, or forming an enamel insulating layer.

[0047] It should be noted that the above-mentioned cylinder wall surface may be the cylinder inner wall surface and / or the cylinder outer wall surface.

[0048] The utility model also provides a shell for a large-capacity battery, comprising the above-mentioned cylinder and a cover plate covering the open end of the cylinder, wherein the surface of the cover plate also has an enamel insulation layer.

[0049] The utility model also provides a large-capacity battery, comprising n single cells and the above-mentioned shell; wherein the n single cells are arranged in the inner cavity of the shell along the x direction;

[0050] In order to facilitate the electrical connection of such large-capacity batteries, avoidance holes are opened on the top plate of the outer shell corresponding to the polarity terminals of each single cell; each single cell polarity terminal extends out of the corresponding avoidance hole as a large-capacity battery polarity terminal (all single cell polarity terminals located on one side serve as the first polarity terminals of the large-capacity battery, and all single cell polarity terminals located on the other side serve as the second polarity terminals of the large-capacity battery, wherein the polarities of the first polarity terminal and the second polarity terminal are opposite), and the top plate area of ​​the outer shell corresponding to the avoidance hole (i.e., the top plate area of ​​the outer shell around the avoidance hole) is fixedly sealed with the single cell shell, so that the avoidance hole portion of the outer shell top plate is sealed.

[0051] It should be noted that:

[0052] 1. The single cell polarity terminal described here can be a single cell pole. In order to avoid that the single cell pole cannot smoothly extend out of the avoidance hole as a polarity terminal or the height of the single cell pole extending out of the avoidance hole does not meet the set requirements, a pole adapter can be connected to the single cell pole, and the overall structure of the single cell pole and the pole adapter can be used as the single cell polarity terminal.

[0053] 2. For the cylinder of the first structure mentioned above, the outer shell top plate here is the cylinder top plate; for the cylinder of the second and third structures mentioned above, the outer shell top plate here is the cover plate covering the open end of the top of the cylinder.

[0054] A shared chamber is arranged in the shell, and the inner cavity of the shared chamber is communicated with the inner cavities of all the single cells.

[0055] The above-mentioned shared chamber can be an electrolyte shared chamber, through which each single cell can be placed in a unified electrolyte environment, ensuring the uniformity of the electrolyte in each single cell; improving the performance and charge-discharge cycle life of large-capacity batteries. The electrolyte shared chamber described here is a liquid channel extending along the length direction of the shell between the shell bottom plate and each single cell, and the liquid channel can be integrally formed with the shell bottom plate, or formed by arranging a support between the lower cover plate of the single cell and the shell bottom plate.

[0056] It should be noted that:

[0057] For the cylinders of the first and third structures mentioned above, the shell bottom plate here is the cylinder bottom plate, and for the cylinder of the second structure mentioned above, the shell bottom plate here is the cover plate covering the open end of the bottom of the cylinder.

[0058] The above-mentioned shared chamber can also be a gas shared chamber, which can achieve gas balance of each single cell through the gas shared chamber, and can also improve the performance and charge-discharge cycle life of large-capacity batteries. The gas shared chamber mentioned here is a gas channel extending along the length direction of the shell between the top plate of the shell and each single cell;

[0059] It should be noted that:

[0060] For the cylinder of the first structure mentioned above, the outer shell top plate here is the cylinder top plate, and for the cylinder of the second and third structures mentioned above, the outer shell top plate here is the cover plate covering the open end of the top of the cylinder.

[0061] The above-mentioned shared chamber can also be a gas-liquid shared chamber, through which each single cell can be placed in a unified electrolyte environment and gas environment, thereby improving the performance and charge-discharge cycle life of a large-capacity battery. The gas shared chamber described here is a channel extending along the length direction of the shell between the side plate of the shell and each single cell;

[0062] It should be noted that:

[0063] For the cylinders of the above three structures, the shell side panels here are the side panels in the cylinder that are parallel to the xz plane.

[0064] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0065] Example 1

[0066] like Figure 2 , which is a schematic diagram of the structure of a cylinder 1 for a large-capacity battery in this embodiment, the left and right ends of the cylinder 1 are open ends, and avoidance holes 2 are provided on the top plate 11 of the cylinder corresponding to the polarity terminals 31 of each single battery 3. The left and right ends are the ends parallel to the yz plane.

[0067] The barrel 1 of this embodiment is made of aluminum material which is the same as the shell material of the single battery 3 and can be integrally formed by an aluminum extrusion process.

[0068] In this embodiment, an enamel insulation layer is formed on both the inner wall and the outer wall of the cylinder 1. The enamel insulation layer has excellent insulation performance. When the large-capacity battery is working, it can reliably achieve insulation between the single battery 3 and the cylinder 1, thereby improving the safety performance of the large-capacity battery. At the same time, the enamel insulation layer also has a certain wear resistance, and is not easy to fall off or be damaged during assembly, transportation, and use, so that the insulation reliability between the cylinder 1 and the single battery 3 is high.

[0069] From the perspective of insulation performance, the thicker the enamel insulation layer, the better the insulation. However, when the thickness is too thick, there will be at least the following two problems:

[0070] 1. When the thickness of the enamel insulation layer is thicker, it is equivalent to increasing the wall thickness of the entire cylinder 1, so that the volume of the entire large-capacity battery increases, which leads to a lower energy density of such a large-capacity battery;

[0071] 2. After increasing the thickness of the enamel insulation layer, since it is completely coated on the wall surface of the cylinder 1, the thermal conductivity of the cylinder 1 will be reduced, thereby resulting in poor heat dissipation performance of such large-capacity batteries.

[0072] Therefore, in order to balance the above problems, in this embodiment, the thickness of the enamel insulation layer is preferably 100um to 300um. The enamel insulation layer of this thickness can ensure the insulation performance while also making the cylinder 1 have better thermal conductivity. In addition, the thickness of the cylinder 1 will not be significantly increased. At the same time, the enamel insulation layer is not easy to fall off and has better wear resistance.

[0073] like Figure 3 and Figure 4, which are a structural schematic diagram and an explosion schematic diagram of the large-capacity battery of this embodiment. It can be seen from the figure that the large-capacity battery of this embodiment includes a shell 4 and single cells 3 arranged in the shell 4.

[0074] The housing 4 includes the above-mentioned cylinder 1 and the cover plates covering the left and right open ends of the cylinder 1; for the sake of distinction, in this embodiment, the cover plates covering the left and right open ends of the cylinder 1 are defined as end plates 5. In this embodiment, an enamel insulation layer is also formed on the surface of the end plate 5, and its thickness is the same as that of the enamel insulation layer on the cylinder.

[0075] The single cells 3 in this embodiment are square-shell cells, and the number is 13. In other embodiments, the number and shape of the single cells 3 can be adjusted according to actual needs. The inner cavity of each single cell 3 includes an electrolyte area and a gas area.

[0076] Each single battery 3 is arranged in the inner cavity of the cylinder 1 along the x direction, and the polarity terminal 31 of each single battery 3 extends out of the corresponding avoidance hole 2 as a large-capacity battery polarity terminal 31. The outer shell top plate (the outer shell top plate in this embodiment is the cylinder top plate 11) area corresponding to the avoidance hole 2 is fixedly sealed with the shell of the single battery 3.

[0077] from Figure 3 and Figure 4 It can be seen from the figure that the polarity terminal 31 of the single cell 3 in this embodiment is a pole of the single cell 3. The pole height of this type of single cell 3 is higher than the pole height of the conventional single cell 3.

[0078] from Figure 4 As can be seen from the figure, in this embodiment, a support member 6 is provided between the single battery 3 and the bottom plate of the housing (in this embodiment, the bottom plate of the housing is the bottom plate 12 of the cylinder) to form the electrolyte sharing chamber 7.

[0079] Figure 5 The support member 6 shown is made of aluminum, and its main part is a flat plate, the shape and size of which are compatible with the shape and size of the bottom plate of the housing. A second support rib 62 extending along the x direction is provided on the lower surface of the flat plate, and a first support rib 61 extending along the x direction is provided on the upper surface of the flat plate. There are three first support ribs 61, each of which extends along the x direction. The three first support ribs 61 are evenly arranged along the y direction, and an electrolyte sharing chamber 7 is formed between two first support ribs 61. In order to improve the electrolyte sharing effect, a notch is opened on the first support rib 61 located in the middle to ensure that the liquid channels (electrolyte sharing chambers 7) located on both sides thereof are connected to each other.

[0080] Figure 6 Two supporting ribs 8 are directly arranged on the bottom plate of the housing along the x direction, and a liquid channel is formed between the two supporting ribs 8 as an electrolyte sharing chamber 7.

[0081] Example 2

[0082] Different from the first embodiment, the cylinder body 1 of the present embodiment is additionally provided with a gas sharing chamber 9 on the basis of the first embodiment.

[0083] like Figure 7 As shown, in this embodiment, a convex portion is provided on the cylinder top plate 11 in a direction away from the cylinder bottom plate 12, forming a gas channel extending along the x direction, which serves as a gas sharing chamber 9. The cylinder 1 of this embodiment is similar to that of the embodiment 1, and can also be integrally formed by aluminum extrusion process.

[0084] like Figure 8 As shown, it is a schematic diagram of the local structure of the large-capacity battery of this embodiment (a schematic diagram of the structure after removing the end plate on one side of the shell). Different from the large-capacity battery in Example 1, the gas area of ​​each single cell 3 in this embodiment is connected to the gas sharing chamber 9 to achieve gas balance of each single cell, thereby further improving the performance and charge and discharge cycle life of the large-capacity battery.

[0085] In some other embodiments, the gas sharing chamber 9 can be used as an explosion-proof channel, that is, during the normal operation of the large-capacity battery, the inner cavity of each single cell is not connected to the explosion-proof channel. When any single cell suffers from thermal runaway, the explosion-proof membrane on the top of the single cell is broken by the smoke in the inner cavity. Then, the inner cavity of the single cell is connected to the explosion-proof channel, and the smoke is discharged through the explosion-proof channel, thereby improving the safety of the large-capacity battery.

[0086] Example 3

[0087] like Fig. 9 , which is a schematic diagram of the structure of the cylinder 1 for large-capacity batteries in this embodiment, both left and right ends of the cylinder 1 are open ends. Different from the embodiment 2, this embodiment has a protrusion on the cylinder bottom plate 12 in the direction away from the cylinder top plate 11, forming a liquid channel extending along the x direction as the electrolyte shared chamber 7. The cylinder 1 in this embodiment is similar to the above-mentioned embodiment 1, and can also be integrally formed by aluminum extrusion process.

[0088] In other embodiments, only the electrolyte sharing chamber 7 or the gas sharing chamber 9 may be provided.

[0089] The structure of the large-capacity battery in this embodiment is as follows Fig.10 and Fig.11 As shown, compared with the large-capacity battery in Example 2, the electrolyte sharing chamber 7 in this embodiment is directly formed on the cylinder 1, and no additional support frame is required. Fig.10 and Fig.11 It can be seen from the figure that the polarity terminal 31 of the single cell 3 in this embodiment is an integral structure of the single cell 3 pole and the pole adapter.

[0090] Example 4

[0091] Different from the above-mentioned embodiment, Fig.12 As shown, the top and bottom of the cylinder 1 in this embodiment are open ends, that is, in this embodiment, the open end of the cylinder 1 is parallel to the xy plane, and can also be integrally formed by aluminum extrusion technology.

[0092] Similar to the first embodiment, the cylinder body 1 of the present embodiment is made of aluminum, and an enamel insulation layer with a thickness of about 100um to 300um is formed on both the inner and outer walls of the cylinder body 1.

[0093] from Fig.12 It can be seen that in this embodiment, a plurality of partitions 10 can be provided in the inner cavity of the cylinder 1 to divide the inner cavity of the cylinder 1 into a plurality of single cell 3 installation cavities. A single cell 3 is fixed in each single cell 3 installation cavity. The side walls of each single cell 3 near the middle part are in contact with the partition 10. The two single cells 3 near the outermost part have one side wall in contact with the partition 10 and the other side wall in contact with the side wall of the cylinder 1. On the first hand, the installation stability of each single cell 3 in the shell can be improved; on the second hand, it can prevent each single cell 3 from swelling, which may cause the problem of reduced cycle performance of large-capacity batteries; on the third hand, the heat generated during the charge and discharge process of each single cell 3 can be transmitted to the outside through the partition 10, reducing the risk of thermal runaway; on the fourth hand, the strength of the cylinder 1 can be enhanced.

[0094] Two or more single cells 3 may be fixed in each single cell 3 installation cavity.

[0095] The partition plate 10 and the rectangular cylinder 1 can be integrally extruded and formed. An enamel insulating layer can also be formed on the partition plate 10 at the same time.

[0096] The structure of the large-capacity battery corresponding to this embodiment is as follows Fig.13 As shown in the figure, it can be seen that the large-capacity battery of this embodiment includes a housing 4 and single cells 3 arranged in the housing 4.

[0097] The housing 4 includes the above-mentioned cylinder 1 and the cover plates covering the upper and lower open ends of the cylinder 1; for the sake of distinction, in this embodiment, the cover plates covering the upper and lower open ends of the cylinder 1 are respectively defined as an upper cover plate 13 and a lower cover plate 14. In this embodiment, an enamel insulation layer is also formed on the surface of the upper cover plate 13 and the lower cover plate 14, and its thickness is the same as that of the enamel insulation layer on the cylinder.

[0098] In some other embodiments, the lower cover plate 14 may be integral with the cylinder body 1 and may be processed by a casting process.

[0099] The single cells 3 in this embodiment are square-shell cells, and the number is 13. In other embodiments, the number and shape of the single cells 3 can be adjusted according to actual needs. The inner cavity of each single cell 3 includes an electrolyte area and a gas area.

[0100] Each single battery 3 is arranged in the inner cavity of the cylinder 1 along the x direction, and the polarity terminal 31 of each single battery 3 extends out of the corresponding avoidance hole 2 as a large-capacity battery polarity terminal 31. The outer shell top plate (the outer shell top plate in this embodiment is the upper cover plate 13) area corresponding to the avoidance hole 2 is fixedly sealed with the shell of the single battery 3.

[0101] from Fig.13 It can be seen that in this embodiment, a groove is provided on the lower cover plate 14 to form a liquid channel extending along the x direction, which serves as the electrolyte sharing chamber 7, and the upper cover plate 13 has a protrusion in the direction away from the lower cover plate 14 to form a gas channel extending along the x direction, which serves as the gas sharing chamber 9.

[0102] Example 5

[0103] This embodiment is a large-capacity battery. On the basis of the large-capacity battery in the above embodiment, a heat transfer tube 15 is additionally provided to improve the heat dissipation performance of the large-capacity battery.

[0104] Specific structure such as Fig.14 As shown ( Fig.14 Taking the example of adding a heat transfer tube 15 on the basis of the large-capacity battery in Example 2, it can be seen from the figure that in this embodiment, a clamping part is provided at the position where each polarity terminal 31 extends out of the housing 4, and the heat transfer tube 15 is fixed on the clamping part.

[0105] The heat transfer tube 15 is fixed in the clamping part so that the heat transfer tube 15 is directly connected to the polarity terminal 31 of the large-capacity battery, and the heat on the polarity terminal 31 where the heat is relatively concentrated is promptly discharged to improve the heat dissipation effect on the top of the large-capacity battery. In addition, when the temperature of the large-capacity battery is lower than the set threshold, the large-capacity battery is heated by passing a high-temperature heat-conducting medium into the heat transfer tube 15; by controlling the temperature of the heat-conducting medium, it can be ensured that the large-capacity battery always operates at a normal operating temperature.

[0106] from Fig.14 It can be seen that in this embodiment, a through groove is provided at the position where the polarity terminal 31 of the single battery 3 extends out of the avoidance hole 2, as a clamping portion. Compared with the through hole, the through groove is more convenient for on-site installation, and the installation requirements are relatively low. The cross section of the through groove is C-shaped, and its opening width is smaller than the widest part of the through groove. Such a design is conducive to the interference fit of the heat transfer tube 15 in the through groove. The arc formed at both ends of the C-shaped through groove has natural tension, which is conducive to the heat transfer tube 15 being tightly clamped in the through groove.

[0107] In this embodiment, the heat transfer tube 15 can be a U-shaped tube section. For the convenience of installation, the U-shaped tube section is divided into three parts, which can be defined as a first tube 151, a second tube 152 and a connecting tube 153 respectively.

[0108] The first tube 151 is fixed in the through slot of the positive terminal 31 of each single cell 3 in the large-capacity battery; the second tube 152 is fixed in the through slot of the negative terminal 31 of each single cell 3 in the large-capacity battery; the two ends of the connecting tube 153 are respectively connected to the ports of the first tube 151 and the second tube 152 on the same side. The remaining two ports of the first tube 151 and the second tube 152 serve as the liquid inlet and liquid outlet of the heat transfer tube 15.

[0109] In some other embodiments, two heat transfer tubes 15 may be used, and the two heat transfer tubes 15 are respectively clamped in the clamping parts of the first polarity terminal and the second polarity terminal 31 of the large-capacity battery.

[0110] When the heat transfer tube 15 contacts the polarity terminal 31 for heat exchange, insulation needs to be provided between the heat transfer tube 15 and the polarity terminal 31 of the large-capacity battery. If the insulation performance between the two is poor, after installing it on the polarity terminal 31 of the large-capacity battery, it will cause a battery short circuit, causing a safety hazard.

[0111] Specifically, the heat transfer tube 15 can be insulated, or the contact portion between the polarity terminal 31 and the heat transfer tube 15 can be insulated, or an insulating gasket can be added between the heat transfer tube 15 and the polarity terminal 31, so that the polarity terminal 31 of the large-capacity battery has reliable insulation performance when exchanging heat with the heat transfer tube 15.

[0112] The heat transfer tube 15 of this embodiment is a metal tube, and the heat transfer tube 15 has an enamel insulation layer, which is formed on the outer wall of the heat transfer tube 15. When the large-capacity battery is working, the enamel insulation layer can reliably achieve insulation between the heat transfer tube 15 and the large-capacity battery polarity terminal 31. At the same time, the enamel insulation layer can also ensure that the heat transfer tube 15 has good heat exchange performance after contacting the polarity terminal 31. In addition, the enamel insulation layer has excellent wear resistance and is not easy to fall off or be damaged during transportation, installation and use, which improves the safety of large-capacity batteries when in use.

[0113] The heat transfer tube 15 is a pipe with a heat exchange function, which is mainly in contact with the polarity terminal 31 of the large-capacity battery and is used to perform heat exchange with the polarity terminal 31 of the large-capacity battery. The cross-sectional shape of the heat transfer tube 15 is not required, as long as it can be in contact with the polarity terminal 31 of the single battery 3 for heat exchange. For example, a square tube, an elliptical tube, a round tube, etc. can be used. In this embodiment, the heat transfer tube 15 is preferably a round tube, which is easy to install and can be made of existing metal tubes, and the cost is relatively low.

[0114] The heat transfer tube 15 in this embodiment specifically adopts a metal tube with good thermal conductivity, such as an aluminum tube, a copper tube, etc. Preferably, the heat transfer tube 15 adopts an aluminum tube with good thermal conductivity and relatively low cost. In order to ensure the thermal conductivity, the thinner the wall thickness of the aluminum tube, the better. However, if the wall thickness of the aluminum tube is too thin, the aluminum tube is relatively soft and is easy to bend and break during installation. Therefore, in this embodiment, the wall thickness of the aluminum tube is preferably 0.5mm to 1.5mm. The aluminum tube with this wall thickness can maintain its installation reliability while having good thermal conductivity, avoiding the risk of easy bending and damage when the wall thickness of the aluminum tube is thin. In specific use, the diameter of the aluminum tube is generally about 10mm to 20mm.

[0115] The heat transfer tube 15 can be manufactured in the following manner:

[0116] First, the heat transfer tube 15 can be made of a whole tube, and the whole aluminum tube is bent into a U-shaped tube, and the two straight tubes of the U-shaped tube are respectively fixed to the first polarity terminal and the second polarity terminal of the large-capacity battery;

[0117] Second, for ease of installation, the heat transfer pipe 15 is a spliced ​​pipe, mainly including a first pipe 151, a second pipe 152 and a connecting pipe 153; the first pipe 151 is fixed to the first polarity terminal of the large-capacity battery; the second pipe 152 is fixed to the second polarity terminal of the large-capacity battery, and the two ends of the connecting pipe 153 are respectively connected to the ports on the same side of the first pipe 151 and the second pipe 152. At the same time, the connecting pipe 153 in this spliced ​​pipe can be an insulating pipe to further increase the insulation performance of the heat transfer pipe 15.

[0118] The heat transfer tube 15 is provided with an enamel insulation layer on the tube wall in contact with the polarity terminal 31 of the large-capacity battery. When the aluminum tube is provided with the enamel insulation layer, the enamel insulation layer is formed on the outer tube wall of the aluminum tube and is an integral structure with the aluminum tube. When the enamel insulation layer is formed on the heat transfer tube 15, the inorganic glass material can be condensed on the outer wall of the metal tube through a high-temperature melting technology, and is firmly combined with the outer wall of the metal tube. After the enamel insulation layer is formed on the outer wall of the metal tube, the heat transfer tube 15 has outstanding excellent properties such as high hardness, high temperature resistance, wear resistance and insulation effect.

[0119] The thicker the enamel insulation layer is, the better the insulation is, but its thermal conductivity will be reduced. In this embodiment, the thickness of the enamel insulation layer is preferably 100um to 300um. The enamel insulation layer of this thickness ensures the insulation performance while also making the tube wall of the aluminum tube have better thermal conductivity. At the same time, the enamel insulation layer is not easy to fall off and has better wear resistance.

[0120] When the enamel insulation layer is provided on the heat transfer tube 15, the enamel insulation layer can be provided only on the part of the tube wall of the heat transfer tube 15 that contacts the polarity terminal 31 of the single battery 3. The enamel insulation layer can also be provided on the entire heat transfer tube 15. When the enamel insulation layer is provided on part of the tube wall of the heat transfer tube 15, the processing and molding process of the enamel insulation layer is relatively complicated. In addition, when the heat transfer tube 15 formed in this way is matched with the polarity terminal 31 of the single battery 3, attention should be paid to its installation position to avoid connecting the heat transfer tube 15 without the enamel insulation layer with the polarity terminal 31 of the single battery 3, thereby generating the risk of short circuit. Therefore, relatively speaking, it is a relatively better way to provide the enamel insulation layer on the tube wall of the entire heat transfer tube 15. This setting method not only makes the enamel insulation layer molding simpler, but also, when the heat transfer tube 15 of this structure is installed with the polarity terminal 31 of the single battery 3, there is no need to consider the installation error between the enamel insulation layer and the polarity terminal 31 of the single battery 3, and the heat transfer tube 15 is more convenient to install on site.

[0121] Example 6

[0122] This embodiment is a large-capacity battery. On the basis of the large-capacity battery in Embodiment 5, a liquid cooling plate 16 is additionally provided to further improve the heat dissipation performance of the large-capacity battery.

[0123] like Fig.15 As shown, in this embodiment, a liquid cooling plate 16 ( Fig.15 The polarity terminal 31 in the figure is an integral structure of the single cell 3 pole and the pole adapter), the heat transfer tube 15 is connected in series with the liquid cooling plate 16 (in some other embodiments, the heat transfer tube 15 and the liquid cooling plate 16 can also be connected in parallel), and the free end of the liquid cooling plate 16 is used as the liquid inlet ( Fig.15 The free end of the heat transfer tube 15 is used as the liquid outlet ( Fig.15 The liquid cooling medium enters the liquid cooling plate 16 through the liquid inlet of the liquid cooling plate 16, is discharged from the liquid outlet, enters the heat transfer tube 15, and is discharged from the liquid outlet of the heat transfer tube 15; or, the free end of the heat transfer tube 15 is used as the liquid inlet, and the free end of the liquid cooling plate 16 is used as the liquid outlet, the liquid cooling medium enters through the liquid inlet of the heat transfer tube 15, is discharged from the liquid outlet, enters the liquid cooling plate 16, and is discharged from the liquid outlet of the liquid cooling plate 16.

[0124] In this embodiment, a liquid cooling plate 16 is added to the bottom of the large-capacity battery in cooperation with the heat transfer tube 15 to effectively dissipate heat from the bottom of the large-capacity battery and the polarity terminal 31, thereby achieving balanced heat dissipation of each single cell 3 in the large-capacity battery, greatly improving the heat dissipation performance of the large-capacity battery and ensuring the safety of the large-capacity battery.

[0125] In some other embodiments, a liquid cooling plate 16 may be added to the side wall of the housing 4 (the side wall of the housing 4 is parallel to the xz plane). The heat transfer pipe 15 and the liquid cooling plate 16 may be connected in series or in parallel.

[0126] In some other embodiments, a liquid cooling plate 16 may be added to the bottom of the large-capacity battery and the side wall of the housing 4 at the same time.

Claims

1. A cylinder for a large-capacity battery, having at least one open end, the inner cavity of the cylinder being used to accommodate n single cells, wherein n is an integer greater than 1; characterized in that: An insulating layer is provided on the wall of the cylinder.

2. The large-capacity battery cylinder according to claim 1, characterized in that: The insulation layer is enamel insulation layer.

3. The large-capacity battery cylinder according to claim 2, characterized in that: The thickness of the enamel insulation layer is 100um to 300um.

4. The large-capacity battery cylinder according to any one of claims 1 to 3, characterized in that: It has two open ends, which are located at the left and right ends of the cylinder; and avoidance holes are provided on the top plate of the cylinder corresponding to the polarity terminals of each single battery.

5. The large-capacity battery cylinder according to claim 4, characterized in that: The bottom plate of the cylinder has a protrusion in the direction away from the top plate of the cylinder to form an electrolyte sharing chamber; the top plate of the cylinder has a protrusion in the direction away from the bottom plate of the cylinder to form a gas sharing chamber.

6. A casing for a large-capacity battery, characterized in that: The invention comprises a cover plate and a cylindrical body for a large-capacity battery as claimed in any one of claims 1 to 5, wherein the cover plate covers an open end of the cylindrical body for a large-capacity battery; and an insulating layer is provided on the surface of the cover plate.

7. A large capacity battery, characterized in that: A casing for a large-capacity battery comprising n single cells and the casing for a large-capacity battery according to claim 6; n single cells are arranged in the same direction in the inner cavity of the shell; A shared chamber is provided in the shell, and the inner cavity of the shared chamber is connected to the inner cavities of all single cells; avoidance holes are opened on the top plate of the shell corresponding to the polarity terminals of each single cell; the polarity terminals of each single cell extend out of the avoidance holes, and the top plate area of ​​the shell corresponding to the avoidance holes is fixedly sealed with the shell of the single cell.

8. The large-capacity battery according to claim 7, characterized in that: It also includes a heat transfer tube. A clamping part is provided at the position where the polarity terminal of each single battery extends out of the avoidance hole. The heat transfer tube is fixed on the clamping part of the polarity terminal of each single battery.

9. The large-capacity battery according to claim 7, characterized in that: The heat transfer tube is a metal tube, and an enamel insulation layer is provided on the wall of the metal tube.

10. The large capacity battery according to any one of claims 7 to 9, characterized in that: The heat transfer tube is a U-shaped tube section, including a first tube and a second tube parallel to each other and a connecting tube connected between the first tube and the second tube; The first tube is fixed on the clamping part of all the single battery polarity terminals on one side, and the second tube is fixed on the clamping part of all the single battery polarity terminals on the other side; the outer tube walls of the first tube and the second tube are provided with enamel insulation layers.

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